"They signed onto it, and now they refuse to comply with it?"
We have one vote for the United States immediately complying with every detail of everything the UN has passed in order to set an example for the Vatican. After all, anything our UN Ambassador didn't veto the US should comply with.
How about a show of hands from those who agree with the Calvinist view that it's shocking and awful for the US to ignore some of what the UN wants the US to do?
Would that be the vote from Pope Benedict XVI?
In the face of the unrelenting growth of global interdependence, there is a strongly felt need, even in the midst of a global recession, for a reform of the United Nations Organization, and likewise of economic institutions and international finance, so that the concept of the family of nations can acquire real teeth. (67)
-- highlights from the paragraph-by-paragraph summary of Caritas in Veritate